Safety drill-tap and die-holder.



G. BARDON.

SAFETY DRILL TAP AND DIE HOLDER.

APPLICATION FILED JUNE 1, 1911.

Patented Oct. 10, 1911.-

Inventor O Attorneys CLARENCE BARDON, 0F ANACONDA, MONTANA.

SAFETY DRILL-TAP AND DIE-HOLDER.

Application filed June 1, 1911.

Specification of Letters Patent.

Patented Oct. 10, 1911.

Serial No. 630,554.

To all whom it may concern:

Be it known that I, CLARnNon BARDON, a citizen of the United States,residing at Anaconda, in the county of Deerlodge and State of Montana,have invented a new and useful Safety Drill-Tap and Die-Holder, of whichthe following is a specification.

The device forming the subject matter of this application, is adapted tobe employed in connection with an upright drill, av lathe, atappingmachine, a screw machine and the like, having a revolving spindle, thedevice being adapted to connect a tool with such spindle, in such mannerthat, should rotation of the tool be temporarily arrested, the rotatingspindle of the machine will be rendered ineffective to twist ofl thetang of the tool.

It is one object of the present invention to provide novel means forfriotionally assembling a tool holder with the end of a driving member.

A further object of the invention is to provide novel means forassembling this driving member with the spindle of a machine.

With the foregoing and other objects in View which will appear as thedescription proceeds, the invention resides in the com bination andarrangement of parts and in the details of construction hereinafterdescribed and claimed, it being understood that changes in the preciseembodiment of invention can be made within the scope of what is claimedwithout departing from the spirit of the invention.

In the accompanying drawingsFigur 1 is a longitudinal section; Fig. 2 isa section on the line 2-2 of Fig. 1; Fig. 3 is a section on the line 33of Fig. 1; and Fig. 4 is a transverse section showing a modified form oftool-holder.

In the drawings, the numeral 1 designates the spindle of a drill press,a milling machine, a tapping machine or the like. In the shank 1 thereis fashioned, ordinarily, an axial opening 2 which may be of taperedform, the opening 2 communicating with a transverse slot 3, extendedthrough the spindle of the machine.

In carrying out the invention there is provided adriving member,embracing a shank 4, adapted to conform to the axial opening 2 of thespindle, the shank 4 being of tapered construction, when the opening 2is tapered. The shank 1 is enlarged in diameter slightly, to form a neck5, which may be threaded as at 6. The neck 5, in its turn, is enlargedto form a shoulder 7 the shoulder 7 being enlarged in diameter to form aflange 8. The end face of the flange 8 is transversely grooved, as shownat 9, for a purpose to be described hereinafter. 7

Disposed in close relation to the end face of the flange 8, is a head10, and abutting against the head 10 is a friction plate 11 Abuttingagainst the friction plate 11 is the head 12 of a tool holder, thereduced neck 14: of which is adapted to receive the shank of the tool tobe rotated. Around the neck 14, and abutting against the portion 12 ofthe tool holder, is a friction washer 15.

The invention further includes a casing in which the flange 8, the head10, the friction disk 11, the head 12 of the tool holder are inclosed.This casing is a two-part structure, and comprises an inner member 16,upon which is threaded an outer member 17 as shown at 18. The part 17 ofthe casing is equipped with an inwardly eX- tended flange 19, againstwhich the friction washer 15 bears, the flange 19 inclosing the neck 14of the tool holder. The part 16 is equipped with an inwardly projectingflange 20, inclosing the shoulder 7 of the driving member, peripherally,the flange 8 of the driving member being engaged beneath the flange 20of the portion 16 of the casing.

That face of the head 10 which is disposed toward the member 8, istransversely slotted. as shown at 21, there being a slot 22 in the edgeof the portion 17 of the casing, and an opening 23 in the wall of theportion 16 of the casing. In order to maintain the slots 9 and 21, andthe openings 22 and 23 in alinement, a dowel pin 24 is extended throughthe flange 8 of the operating member, to engage the flange 20, with theportions 16 of the casing, and. to engage, likewise, with the head 10.This dowel pin 24 holds the head 10, the element 16 of the casing, andthe portion 8 of the driving member together, for simultaneous rotation.but the head 10 is movable longitudinally of the casing, upon the dowelpin 24:, under the action of a wedge shaped locking key 50, insertibleinto the alined openings 9, 22, 21 and 23. At this point it may bestated that the dowel pin 24; serves as a means for alining theseseveral openings, and, as will be explained hereinafter, the strainincident to uniting the parts 8 and 10 for simultaneous rotation, isborne by the key 50, and not by the dowel pin 24.

The driving member carries a transverse structure, adapted to receivemeans whereby the driving member may be united with the spindle 1. Thistransverse structure may consist of a plate 25, threaded upon the neck 5of the shank of the tool holder. In the plate 25 there are oppositelypositioned openings, through which are extended the ends of the arms 26,having angular extensions 27, adapted to enter transverse opening 3 ofthe spindle 1. Upon the ends of the arms 26, and binding against theplate 25, are nuts 28. If desired, this transverse structure whereby thearms 26 are received, consist of separable parts, having openings toreceive the arms, the parts being adapted to be clamped, by means ofscrews or other elements adapted to a like end, in a groove formedcircumferentially in the shank of the tool holder.

Referring to Fig.4, the reference character 140 indicates that portionof the structure which is denoted by the numeral 14 in Fig. 1. The neck140 of the tool-holder may, if desired, be provided with a pair ofslidable keys 141, dove-tailed into the member 1 10, as shown at 1 12,for sliding movement, the keys 14:1 obviously constituting a means forholding a tool in the portion 140 of the holder.

In practical operation, the shank 1 is inserted into the axial opening 2of the spindle 1, and the angular extensions 27 of the arms 26 areengaged in the transverse slots 8 in the spindle 1. Obviously, byrotating the nuts 28, the angular extensions 27 may be advanced towardthe plate 25, the shank 4 being bound firmly in the opening 2. Thus, thedriving element is securely assembled with the spindle 1. The dowel pin24: serves to maintain the transverse groove 9 in the lower face of thepart- 8, alined with the transverse groove 21 in the adjacent face ofthe head 10. Moreover, since this dowel pin enters the part 16 of thecasing, with which the part 17 of the casing is threaded, the openings22 and 23 in the casing will aline with the grooves 9 and 21, so thatthe wedge shaped locking key 50 may readily be mounted in place. Thiskey 50, registering in the openings and grooves above referred to, willserve to lock the casing, the portion 8 of the tool holder, and the head10, together, for simultaneous rotation. When the key 50 is seated, thehead 10 will be thrust against the friction disk 11, the friction disk11 will be thrust against the head 12 of the tool holder, the head 12 ofthe tool holder will be thrust against the friction washer 15, thefriction washer 15 will be thrust against the flange 19 of theportion'17 of the casing.

From the foregoing it will be seen that the tool holder 12-14E will beheld frictionally against the head 10, the head 10 being interlockedwith the driving member i8, for rotation therewith. However, should therotation of the tool be stopped suddenly, the shank of the tool will notbe twisted 01f, owing to the fact that the tool holder is held forrotation, by friction only.

The device herein disclosed is simple and rigid in construction. Thereare no ex posed. threads subject to damage, and no wrenches or othertools are necessary in order to adjust the friction with which the toolholder is held. The tapered key 50 extends slightly on both ends beyondthe casing 15-17, and by driving the key 50 in opposite directions, thefriction wherewith the tool holder is held, may be adjusted. Should thefriction members 11 and 15 wear thin, permitting the key 50 to extendtoo far through the casing, the portion 17 of the easing may be rotatedupon the portion 16, thereby taking up the wear, it being noted that theportion 17 of the casing has a plurality of openings 22 therein, toreceive the key 50, the construction being such that the member 17 needbe rotated but through a relatively small are, before one pair ofopenings is alined with the opening 23 in the part 16, to receive thekey 50.

As will be readily understood, the friction wherewith the tool holder1211 is held for rotation with the driving member 4e-8, may be adjustedat any time by tapping lightly upon the wedge key 50. By

removing the key 50, the device may be taken down readily, permittingthe insertion of different forms of shanks, to accommodate machines ofdifferent makes, thereby doing away with the expense incident to theprovision of a complete set of chucks.

Having thus described the invention, what is claimed is:

1. A device of the class described comprising a driving member; a toolholder; a casing in which the adjacent ends of the driving member andthe tool holder are inclosed, the driving member and the tool holderbeing individually rotatable in the casing; a head rotatable in thecasing, between the driving member and the tool holder; and a movablemember interengaged with the driving member and with the head, to securea simultaneous rotation of the driving member and the head, and toadvance the head against the tool holder, thereby to unite the toolholder and the driving member, frictionally, for simultaneous rotation.

2. In a device of the class described, a casing; a tool holder and adriving tool retainer terminally inclosed in the casing; a head in thecasing, between the tool holder and the driving member; and a key insertible into an opening in the casing, and into registering grooves in thedriving member and in the head, to advance the head toward the holder,and to advance the holder toward the casing, thereby to unite the toolholder frictionally with the driving memher for simultaneous rotationtherewithf 3. In a device of the class described, a casing consisting ofremovable connected parts; a tool holder and a driving member terminallyinclosed in the casing; a head in the casing, between the tool holderand the driving member; a key insertible into an opening in the casing,and into registering grooves in the driving member and in the head, toadvance the head toward the holder, andto advance the holder toward thecasing, thereby to unite the tool holder and the driving member,frictionally, for simultaneous rotation; and a device connecting thedriving member with the head and with the casing, to aline the groovesand the opening, said device permitting the head to have movementlongitudinally of the casing, under the action of the key.

at. In a device of the class described, a member having a shank adaptedto enter the axial opening of a driving element; a transverse structureremovably mounted upon the shank; arms extended into said structure, andhaving angular extensions adapted to enter a transverse slot in thedriving element; and means upon the arms to engage said structure, andto move the extensions toward said structure.

In testimony that I claim the foregoing as my own, I have hereto affixedmy signature in the presence of two witnesses.

CLARENCE BARDON.

Witnesses:

DAVID GRATTAN, FRED B. SMITH.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

